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Questions tagged [error]

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Geth error: Genesis not found in chain - error on the worker node!

Good afternoon. After restarting the server when trying to run get I get an error. Start command: geth --rpc --rpcport 8545 --rpccorsdomain "*" --rpcapi "db,eth,net,web3,personal" --cache 8192 --...
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1answer
16 views

rpc error with payload and exception thrown in contract code

This is the problem I get when trying to run my contract! And then when I go ahead and run it, this pops up This is my js code: import React, { Component } from 'react'; import Web3 from 'web3'; ...
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2answers
85 views

Remix Deploy Error encoding arguments

I'm building a simple fund raising smart contract and having problems deploying this through Remix. I'm wanting to set the "goal" and "minimum contribution" values (in wei) during the contract ...
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2answers
52 views

Trying to create an instance of an abstract contract

pragma solidity ^0.5.0; import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol'; contract SubToken{ mapping(address => uint) balances; ...
2
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1answer
35 views

How does one retrieve revert/require error messages from RPC

In both of these questions, the user is asking if it's possible to get the error string from a revert or require. The answers say, basically, "Yes" and point to Truffle or other methods. VM Exception ...
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1answer
45 views

create ERC-20 token from a contract function

I would like to do a function create contract with ERC-20 interface. But I have a few problems. If anyone help me I’ll be appreciated. Here’s the code : pragma solidity ^0.5.0; import 'https://...
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1answer
32 views

create contract from function / contract

**Hey guys ! I just try to make a contract for create a contract. It supposed to be ERC-20 interface so my first contract for this. But I don’t know how can I do _mint and createContract functions ...
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1answer
24 views

Expected identifier but got reserved keyword 'reference' Product public reference; ^-------^ [closed]

hello guys I am a beginner. I would like to make a function for create a contract. I found a example on the internet but gives me an error so I dont know what should I do. Anyone can help me ? ...
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2answers
37 views

Error: gas required exceeds allowance or always failing transaction in Remix using Ropsten network

I am facing this error , My Contract is quite simple pragma solidity ^0.5.0; contract sendEther { address payable sender; function showReceiver() public view returns (address payable) { ...
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2answers
15 views

it'll give me a parser error

pragma solidity ^0.5.0; contract fisrtCoin { address deployer; mapping(address=>uint) balances; public function fisrtcoin() { deployer = msg.sender; } public ...
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1answer
85 views

'types/values length mismatch',

Hey guys I had a problem with my return function here's my smart contract : pragma solidity >=0.4.0 <0.7.0; contract NewHello{ address owner; address newOwner; constructor()public{ ...
1
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1answer
79 views

Function declared as view, but this expression (potentially) modifies the state requires payable

I'm trying to change the an address data variable to a one, which is selected via a function. Keep getting the below error. Function declared as view, but this expression (potentially) modifies the ...
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3answers
154 views

ParserError: Expected ',' but got identifier

pragma solidity >=0.4.0 <0.7.0; contract NewHello{ struct kullanicilar{ string name; string surname; uint age; } event infoChanged( string name, ...
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0answers
150 views

Etherscan says “we were unable to locate a matching bytecode (err_code_2)”

Please help me with this error... I dont know what is it?
0
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1answer
126 views

Transaction Error. Exception thrown in contract code. (MetaMask)

When I use Ganache it runs with no problem and MetaMask too. When I run my contract in my private Ethereum network (Geth). When I use a function from my contract the MetaMask gives me this error (...
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0answers
24 views

Get the address of a contract without using Remix-ide

I'm studying Ethereum, I need to get the contract address for interact with web3, I can not use Remix-IDE for this since that I installed Kali as an operating system. How I get the contract address ...
2
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2answers
149 views

Syntax Error: Type tuple(bool,bytes memory) is not implicitly convertible to expected type bool

I am trying to compile the following program: pragma solidity ^0.5.1; contract MKotET1_1{ address payable king; uint public claimPrice = 100; function calculateCompensation() public ...
1
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1answer
21 views

call: Warning: Unused local variable

I am trying to compile the following code: pragma solidity ^0.5.1; contract MKotET1_1{ address payable king; uint public claimPrice = 100; function calculateCompensation() public returns(uint)...
2
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1answer
21 views

I have a ParserError here “function Stratus(string _greeting) {”

pragma solidity ^0.4.19; contract Stratus { string public greeting; address public owner; event GreetingChanged (string oldGreeting, string newGreeting) function Stratus(string ...
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2answers
68 views

Type uint256 is not implicitly convertible to expected type int256

I'm trying to compile the following keep getting an error, even though used this before in second code and its working fine. Simply trying to change the temp to the new temperature set by the user, so ...
0
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1answer
153 views

MetaMask - RPC Error: Error: WalletMiddleware - Invalid “from” address

I'm trying to create a simple Dapp (via tutorial) which would allow me to send Ether from sender to receiver (via a contract with an address that automatically approves the transaction). The truffle ...
1
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0answers
18 views

How to process null TransactionReceipt?

I have some transaction that is sent and from time to time when I call the eth_getTransactionReceipt I get a null. I see esentially two approaches for handling this: I could reiterate the call to ...
0
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1answer
474 views

TRUFFE MIGRATE: Saving migration to chain.Error: Error: Error: Returned error: VM Exception while processing transaction: invalid opcode

$ truffle migrate Compiling your contracts... =========================== > Everything is up to date, there is nothing to compile. Starting migrations... ====================== > Network name: ...
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0answers
49 views

Using web3j with infura returns null

I've used web3.js to handle my contracts, and it worked very well. But web3j is pretty hard for me since the beginning. I'm using android studio, infura, web3j. Since I don't know very much about ...
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0answers
22 views

DeclarationError: Undeclared Identifier. Did you mean “_data”? data = _data ^__^. All i want is to create a cryptocurrency

pragma solidity ^0.5.1; contract owner { address public owner; function owned() public { owner = msg.sender; } function set( string memory _data) public { data = ...
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0answers
31 views

How to handle estimate gas cost error?

I am programming a button for a transaction which shall only appear if the transaction is possible. Therefore, I am using the following code contract.methods.function(parameters) .estimateGas({...},...
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3answers
55 views

Solidity Compatibility Configuration

I am a cyber security analyst who is new to ethereum and working on a project to study crypto security. It's a series of 22 vulnerable smart contracts that you're supposed to exploit. For anyone who ...
0
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0answers
41 views

Accidentally sent REN (ETH token) to my ETH contract address using my Ledger Nano S. Can someone help please? [duplicate]

I sent REN (ETH token) to my ETH contract address by accident while using my ledger nano s. Can someone help me understand what's happened to the tokens and if I can retrieve my REN token from my ETH ...
1
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0answers
18 views

MetaMask returns different error - not longer working

I am calling the MetaMask promt successfully with this: ethereum.enable().then(response => { console.log("ABC"); }).catch(error => { console.log("XYZ") }); However, when I disagree ...
0
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0answers
26 views

Error while deploying smart contract ,BadFunctionCallOutput

The log i am having while deploying a smart contract: -------- load log data -------- user.address = 0x2154f8B602c470ae7F10f242DCC88Ae6221bb263 contract.address = ...
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0answers
54 views

Cannot read property length of undefined in Remix / tried to increase gas not working

My contract was working just fine, but I don't know what happened, now when I try to interact with a new instance of my contract from Remix I get this error 'cannot read property "length" of undefined'...
0
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2answers
272 views

Why am I Getting: Transaction Error. Exception thrown in contract code in Real?

WE Had Create A Dapp Like POWHD, we Already Deployed It And Some Of Transactions Are Already Done well. But After Some Time The issue I'm encountering with my real contract (Dapp) is that trying to ...
0
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1answer
34 views

Why does updating an external variable results in an error?

I'm trying to update a variable within an external contract. My 2 contracts are as follow: pragma solidity ^0.4.25; contract MainContract { string public variable1; function setVariable1(string ...
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0answers
87 views

- does not trigger a Solidity `revert` statement

My Smart contact was running smoothly .I was smoothly executing the function successfully . MinterFunction(address account, uint256 value) public { value = value.mul(1 finney); require(...
1
vote
2answers
25 views

Simple contract throws for no apparent reason

the thing is that i have a very simple contract code that I wrote as a kind of "Hello World!", but it doesn't seem to work properly, and I can't see any reason why it wouldn't work. The code I'm ...
0
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3answers
86 views

REMIX:This contract does not implement all functions and thus cannot be created

What should I do? pragma solidity ^0.4.21; contract ScoreInterface { function hit() public; function score() public view returns (uint); } This contract does not implement all ...
2
votes
1answer
105 views

Metamask Error messages shows only revert

I have a little problem with the error messages I receive from MetaMask. In my dApp I have a modifiers which should throw an error with an error message. However, in MetaMask I only receive the RPC ...
4
votes
2answers
565 views

Solidity! Invalid implicit conversion from string memory to bytes memory requested

pragma solidity ^0.5 contract ProofOfExistence { // ... some code here function proofFor(string memory document) public view returns(bytes32) { return sha256(document); } //...
2
votes
1answer
65 views

How to handle require/revert/assert errors properly

I'm trying to find an easy pattern to revert/rollback a write transaction. The first idea was to log a GenericErrorEvent but then I noticed that it will never be emited if any require/revert/assert ...
1
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2answers
181 views

Calling an address array in web3 returns an error that the method needs arguments

I'm declaring a public address array in my contract, but when I call it, I get an error saying it's expecting an argument. Can someone shine a light on what is happening here? Contract.sol uint ...
1
vote
2answers
33 views

Why is solidity throwing “Note: The constructor should be payable if you send value. ”, when clearly the issue is elsewhere?

I'm writing a contract on Remix that is able to deploy and track child contracts. Here are the 2 contracts: pragma solidity ^0.5.0; Contract Factory contract ContractFactory{ ChildContract[] ...
0
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1answer
211 views

ReferenceError: address is not defined

Truffle v5.0.5 (core: 5.0.5) Solidity v0.5.0 (solc-js) Node v10.15.1 ReferenceError: address is not defined. const ApprovalContracts = artifacts.require('../../contracts/ApprovalContracts.sol'); /...
0
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0answers
20 views

Not storing Item in variable

I am working on making a game where users can collect items. I have chosen to store the ERC721 tokens that represent the items in this way: Item struct: User struct and map that maps account-...
0
votes
1answer
93 views

Cannot read property 'hexToAscii' of undefined

deployedContract.deploy({ data: bytecode, arguments: [listOfCandidates.map(name => web3.utils.hexToAscii(Rama))] }).send({ from: '0xfb9286cde20bbd5ed60ee3bb156f9d9938c5b151', gas: 1500000, ...
0
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0answers
11 views

My ethereum based dapp throwing error :Unable to get UserError: ERROR: The returned value is not a convertible string:

I have setup a private ethereum network on an AWS ubuntu instance. The application has been deployed using truffle and uses metamask to approve transactions. There are two different pages one for ...
0
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1answer
114 views

NOOB Error : Transaction mined but execution failed

i´m learning Solidity now, and i saw this code on web but when i try to use the method "Deposito" i receive a error. Someone knows what's that ? (PS.: I try to put the value but every time i chose ...
0
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0answers
149 views

installing Truffle node-gyp rebuild Error

im trying to install Truffle and have run into numerous problems - made some headway after getting an earlier version of python but camt seem to figure out this error - could someone point me in the ...
1
vote
1answer
329 views

web3 is not defined problem

This is my simple html source code for my website. <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewpoint" content="width=device-width, ...
1
vote
1answer
313 views

“before all” hook: prepare suite

This is the error code: Adoption.sol code: TestAdoption.sol code: I dont know how to solve this, it fails when i try to use this comand: "truffle test". Thanks.
2
votes
1answer
860 views

Invalid bytes32 value [duplicate]

I am trying to learn about solidity so I just watch a tutorial about it, I already copy the same code as the tutorial but there is an error with bytes32. Here it is: That is the deploy code: And ...